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View Compilation Error

0_0_4798116_18982\Main.java:7: 找不到符号
符号: 类 IOException
位置: 类 Main
    public static void main(String[] args) throws IOException {
                                                  ^
0_0_4798116_18982\Main.java:8: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        ^
0_0_4798116_18982\Main.java:8: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                ^
0_0_4798116_18982\Main.java:8: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                                   ^
0_0_4798116_18982\Main.java:17: 找不到符号
符号: 类 Iterator
位置: 类 Main
            Iterator<Integer> it= map.iterator();//输出
            ^
5 错误


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